﻿namespace org.apache.lucene.analysis.it
{

	/*
	 * Licensed to the Apache Software Foundation (ASF) under one or more
	 * contributor license agreements.  See the NOTICE file distributed with
	 * this work for additional information regarding copyright ownership.
	 * The ASF licenses this file to You under the Apache License, Version 2.0
	 * (the "License"); you may not use this file except in compliance with
	 * the License.  You may obtain a copy of the License at
	 *
	 *     http://www.apache.org/licenses/LICENSE-2.0
	 *
	 * Unless required by applicable law or agreed to in writing, software
	 * distributed under the License is distributed on an "AS IS" BASIS,
	 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	 * See the License for the specific language governing permissions and
	 * limitations under the License.
	 */

	/* 
	 * This algorithm is updated based on code located at:
	 * http://members.unine.ch/jacques.savoy/clef/
	 * 
	 * Full copyright for that code follows:
	 */

	/*
	 * Copyright (c) 2005, Jacques Savoy
	 * All rights reserved.
	 *
	 * Redistribution and use in source and binary forms, with or without 
	 * modification, are permitted provided that the following conditions are met:
	 *
	 * Redistributions of source code must retain the above copyright notice, this 
	 * list of conditions and the following disclaimer. Redistributions in binary 
	 * form must reproduce the above copyright notice, this list of conditions and
	 * the following disclaimer in the documentation and/or other materials 
	 * provided with the distribution. Neither the name of the author nor the names 
	 * of its contributors may be used to endorse or promote products derived from 
	 * this software without specific prior written permission.
	 * 
	 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
	 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
	 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
	 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
	 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
	 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
	 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
	 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
	 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
	 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	 * POSSIBILITY OF SUCH DAMAGE.
	 */

	/// <summary>
	/// Light Stemmer for Italian.
	/// <para>
	/// This stemmer implements the algorithm described in:
	/// <i>Report on CLEF-2001 Experiments</i>
	/// Jacques Savoy
	/// </para>
	/// </summary>
	public class ItalianLightStemmer
	{

	  public virtual int stem(char[] s, int len)
	  {
		if (len < 6)
		{
		  return len;
		}

		for (int i = 0; i < len; i++)
		{
		  switch (s[i])
		  {
			case 'à':
			case 'á':
			case 'â':
			case 'ä':
				s[i] = 'a';
				break;
			case 'ò':
			case 'ó':
			case 'ô':
			case 'ö':
				s[i] = 'o';
				break;
			case 'è':
			case 'é':
			case 'ê':
			case 'ë':
				s[i] = 'e';
				break;
			case 'ù':
			case 'ú':
			case 'û':
			case 'ü':
				s[i] = 'u';
				break;
			case 'ì':
			case 'í':
			case 'î':
			case 'ï':
				s[i] = 'i';
				break;
		  }
		}

		switch (s[len - 1])
		{
		  case 'e':
			if (s[len - 2] == 'i' || s[len - 2] == 'h')
			{
			  return len - 2;
			}
			else
			{
			  return len - 1;
			}
		  case 'i':
			if (s[len - 2] == 'h' || s[len - 2] == 'i')
			{
			  return len - 2;
			}
			else
			{
			  return len - 1;
			}
		  case 'a':
			if (s[len - 2] == 'i')
			{
			  return len - 2;
			}
			else
			{
			  return len - 1;
			}
		  case 'o':
			if (s[len - 2] == 'i')
			{
			  return len - 2;
			}
			else
			{
			  return len - 1;
			}
		}

		return len;
	  }
	}

}